Add monetization spine + Build Your Own Case (Min Sak)

- Stripe: StripeClient.php, checkout/portal/webhook endpoints, idempotent event handling
- FreeTier: tier-aware credits (free/light/pro/pro_plus), bonus_balance, hourly caps per tier
- pricing.php + billing.php: 4-tier cards, 3 topups, Customer Portal, balance breakdown
- Min Sak: CaseStore.php, AzureDocIntelligence.php, AzureSearchAdmin.php — per-user hybrid RAG
- api/case/: upload, list, delete, ingest-callback (HMAC-auth'd from n8n)
- award-survey-credits: inter-site HMAC endpoint for dobetternorge.no survey bonus
- dashboard.php: tier badge, balance breakdown card, Min Sak CTA, survey CTA
- KorrespondAgent + all 3 other agents: use_my_case toggle wired to dbnToolsCaseContext()
- bootstrap.php: dbnToolsCaseContext(), dbnToolsIntersiteSecret(), dbnToolsCurrentTier()

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

barnevernet.php

@@ -41,8 +41,9 @@ require_once __DIR__ . '/includes/layout.php';
                         <label><input type="radio" name="bvjEngine" value="azure_mini" checked> Azure gpt-4o-mini &#9733; <small class="control-hint">(~30-60s)</small></label>
                         <label><input type="radio" name="bvjEngine" value="azure_full"> Azure gpt-4o <small class="control-hint">(best · ~90-180s)</small></label>
                         <label><input type="radio" name="bvjEngine" value="gpu"> GPU qwen2.5:14b <small class="control-hint">(local · ~45-90s)</small></label>
+                        <label><input type="radio" name="bvjEngine" value="dbn_legal_v3"> &#x1F1F3;&#x1F1F4; Norwegian specialist v3 &#9733; <small class="control-hint">(dbn-legal-agent-v3 · ~20-60s)</small></label>
                     </div>
-                    <p class="upload-hint">Engine applies to the final advocacy synthesis only. Document classification, party extraction, and timeline are always fast (azure-mini).</p>
+                    <p class="upload-hint">Engine applies to the final advocacy synthesis only. Norwegian specialist v3 is the recommended choice for Barnevernet documents — it is fine-tuned on § 4-25, Strand Lobben, forvaltningsloven § 17/§ 41, and procedural red-flag detection. Classification, party extraction, and timeline always use azure-mini.</p>
 
                     <div class="dr-slice-section">
                         <p class="control-label">Corpus slices</p>